package com.sky.aspect;


import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;


/**
 * 公共字段自动填充切面类
 */
@Aspect //定义为切面类
@Component //将他交给容器管理
@Slf4j
public class AutoFillAspect {
    @Before("@annotation(com.sky.anno.AutoFill)")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段填充");
         //1. 获取目标方法上的注解,并拿到注解里面的属性值
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); //方法签名
        Method method = methodSignature.getMethod();//方法对象
        AutoFill autoFill = method.getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();
        //2 获取到目标方法的参数对象
        Object[] args = joinPoint.getArgs(); //employee , category等等
        if(args == null || args.length == 0)  return;
        Object entity = args[0]; //拿到对象
        //3. 判断注解中的属性值，如果是insert ，就补充四个基础字段（更新时间，创建时间，创建人，更新人）
        try {
            if(operationType == OperationType.INSERT){
                //通过反射补充属性值
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                setCreateTime.invoke(entity, LocalDateTime.now());
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
                setCreateUser.invoke(entity, BaseContext.getCurrentId());
            }else {
                //4. 判断注解中的属性值，如果是update ，就补充四个基础字段（更新时间，更新人）
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
            }
        }
        catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

}
